<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        var arr = [{ label: '男', value: 1 }, { label: '女', value: 0 }]

        function f(arr) {
            // 声明一个空数组
            const a = []
            arr.forEach(item => {
                //给数组添加元素
                a.push(item.label)
            });
            return a
        }
        
        var arr2 = f(arr);
        console.log(arr2)
        // arr2 = ['男', '女']
    </script>
</body>

</html>